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Astron. Astrophys. 348, L17-L20 (1999) AcknowledgementsWe thank the referee, T. de Jong, for his valuable comments on the manuscipt. This work was supported by the DFG (grant Se 420/15-1), the BMBF (grant 05 3BT13A 6), and by the FAZIT-Stiftung . ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: July 16, 1999 ![]() |